Repost: RFA [4.1]: improvement to if-conversion and cross-jumping (PR20070)

[Joern RENNECKE]

Bernd Schmidt wrote:

>  is partially duplicated just a few lines down, without the 
> reload_completed guard.  This is very confusing, please merge the two.

Done.  I have attached the new patches I am currently regtesting.

> Also, it doesn't seem to test for rvalue when marking the reg as live?

rvalue is passed as a parameter to assign_reg_reg_set.
 
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